Merge #14619: tests: Fix value display name in test_runner help text

5a05aa2db2 Add metavar to match var name in help text + Change wording for better readability (Martin Erlandsson)

Pull request description:

  The help text given by `test/functional/test_runner.py -h` refers to the value `n`, which is defined as `COMBINEDLOGSLEN` in the list of commands.

  To make the help text consistent, this PR changes the display name `COMBINEDLOGSLEN` to `n` by setting the argparse [`metavar`](https://docs.python.org/3/library/argparse.html#metavar) attribute. (`metavar` only changes the _displayed_ name)

  Alternatively: Do the opposite and change the help text to use `COMBINEDLOGSLEN`.

  ---

  Before PR:
  ```
  ➜  bitcoin > test/functional/test_runner.py -h | grep -A 1 combinedlogslen
    --combinedlogslen COMBINEDLOGSLEN, -c COMBINEDLOGSLEN
                          print a combined log (of length n lines) from all test nodes and test framework to the console on failure.
  ```

  After PR:
  ```
  ➜  bitcoin > test/functional/test_runner.py -h | grep -A 1 combinedlogslen
    --combinedlogslen n, -c n
                          print a combined log (of length n lines) from all test nodes and test frameworks to the console on failure.
  ```
  ---
  Also, fixed pluralization typo.

Tree-SHA512: a1124a4976d29fae1e8ecd7fa2ac523b7f05d541c611166532f44692995691a96faf797fa71582d78634f328b500cbee49c6ef296c8f1a898a57c050cc4e721d

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